<template>
  <div class="list" ref="wrapper">
     <div>
       <div class="area">
          <!-- border-topbottom 1像素边框-->
          <div class="title border-topbottom">当前城市</div>
          <div class="button-list">
            <div class="button-wrapper">
              <div class="button">{{this.currentCity}}</div>
            </div>
          </div>
       </div>
       <div class="area">
          <!-- border-topbottom 1像素边框-->
          <div class="title border-topbottom">热门城市</div>
          <div class="button-list">
            <div 
                class="button-wrapper" v-for="item of hot" :key="item.id"
                @click="handleCityClick(item.name)"    
            >
              <div class="button">{{item.name}}</div>
            </div>
          </div>
       </div>
       <div 
        class="area" 
            v-for="(item,key) of cities" 
            :key="key"
            :ref="key"
        >
          <div class="title border-topbottom">{{key}}</div>
          <div 
            class="item-list" 
            v-for="innerItem of item" 
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)" 
         >
            <div 
                class="item border-bottom" 
            >
                {{innerItem.name}}
            </div>
           <!-- 最好加个判断，最后不加 border-bottom <div class="item ">阿拉尔</div> -->
          </div>
       </div>
     </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'
export default {
    name: 'CityList',
    props: {
        hot: Array,
        cities: Object,
        letter: String
    },
    computed: {
        ...mapState ({
            currentCity: 'city'
        })
    },
    methods: {
        handleCityClick (city) {
            // this.$store.commit('changeCity',city)
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations (['changeCity'])
    },
    watch: {
        letter () {
            if (this.letter) {
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.wrapper)
    }
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color #ccc
        &:after
            border-color #ccc
    .border-bottom
         &:before
            border-color #ccc
    .list
        overflow hidden
        position absolute
        top 1.58rem
        left 0
        right 0
        bottom 0
        .title
            line-height .54rem
            background #eee
            padding-left .2rem
            color #666
            font-size .26rem
        .button-list
            overflow hidden
            padding .1rem .6rem .1rem .1rem
            .button-wrapper
                float left
                width 33.33%
                .button
                    text-align center
                    margin .1rem
                    padding .1rem 0
                    border .02rem solid #ccc
                    border-radius .06rem
        .item-list
            .item
                line-height .76rem
                padding-left .2rem
</style>